Seal-lock



(Model.)

'Lg M. JUNKIN.

, SBAL LOOK.

Patented Feb. 21.1882.

u PET R8. Mmmgmww. wmn DK UNITED STATES PATENT OFFICE.

LAWRENCE M. JUNKIN, OF PITTSBURG, PENNSYLVANIA.

v''sEAL-Lo c K.

SPECIFICATION forming' part of Letters Patent o. 253,870, dated February 21, 1882. Application filed November 17, 1881. v (Model.)

To all 'whom it may concern:

Be it known that I, LAWRENGE M. J UNKIN, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new anduseful Improveinent in SealqLocks; and I do hereby declare the followingV to be a full, clear, and exact description thereof.

My invention relates to that class of seallocks in which the seal is of frangible metal 01' glass, and isA so placed that when locked the seal must be broken before it can be unlocked.

To enable others skilled in the art to make I and use my invention, I will now describe it by reference to the accompanying drawings, in whichy Figure 1 is a plan view of the face-plate and hasp. Fig. 2 is a longitudinal section, and Fig. 3 is a side view, of the lock.

Like letters of reference indicate like parts in each.

This lock is especially designed for use on freight-car doors. In the drawings, a indicates a part of such a door, the hasp. b being pivoted thereto at b'; and c indicates the frame of the door, in which the lock is placed in a hole or mortise, d. The lock is formed of three pieces and a spiral spring. The first piece is the barrele, which is round in cross-section, and has a stem, e', of polygonal shape,extending from its lower end, and a thumb-piece or button, 82, at its upper end. The second piece is'a sliding collarfl, placed on the stem e', and held up against the shoulder 83 of the barrel e by the before-mentioned spring g, said spring being held in place on the stem by a washer, h,- which affords a suitable bearing for the lower end of the spring, and in turn rests upon pin, 84. The third piece is the face-plate fi,

` having a sleeve or tubular projeetion, fi', which extends down around the barrel e. At opposite points on the lower edge of the sleeve i' are inclines tz, which at their lower ends terminate in notches or recesses ta. In the side of the sleeve i' is an inclined slot, it, through which a guidepin, 85, is designed to project from the barrel e. On the outside of the sliding collar f are two pins,f', which engage the inclines and recesses W, being forced against them by the pressure of the spring g. The lock is se* cured in the mortise d` by screws 7a or otherwlse.

Wheuit is desired to lock the door the hasp b, which has a hole,,b2, for that purpose, is placed over the barrel of the lock. When the barrel is in its normal position its upper end is flush with the bottom of the recess b3 in the hasp. Then a frangible metal or glass seal, l, having a center slot, l', to pcrmit it to pass, is placed over the head 82. `The thiekness of the'seal is less than the distance between the' head 82 and the top of the' barrel e, so that when the barrel is turned the lower side of the-head will ride up on the edges of the slot l'. The' seal being in place, the barrel is turned by means of the head or thumb-piece e2 onequarter way around, or until the head e? stands at right angles to the slot Z'. This causes the pins' to ride down on theinclines tz, com pressing the spring g, and spring up -into the rek cesses i. As it is then impossible for the pins f' to turn either way, or for the barrel to be rotated until they are pushed down out of the recesses, and as this cannot be done while its seal remains under the head, the hasp is securely locked until the seal is broken and removed. Then the barrel can be pushed down far enough to carry the pin's clear of the re- I cesses if* and permit the barrel to be turned.

It is apparent that the construction of some o of the parts may be v'aried without changing the'principle of my improvementmas, for instance, the shank e' may be round, with a feather and spline, or any other shape to keep the collar ffrom turning on it. There may be but one incline and recess ou the sleeye i', and the guide-slot 't'tjand pin be arranged on the opposite side, or there may be more inclines than two, the purpose being to secure a ratchet movement of the pins, which will force down the collarf and compress the spring. When the hasp is in place itvcovers two of the screws 7a k, so that the faceplate cannot be unscrewed and taken ofi' when the hasp is locked. p

My improved lock is simple and cheap in construction and eiiicient in operation.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. The combination, in a Seal-look, of a rohaving both an axial and longitndinal move- [o tating barrel, a sliding collar having projeotment with a recessed hasp and a slotted franing pins mounted on the stem of the barrci so gible Seal of metal or glass. as to turn with it, a spring mounted ou the In testimony whereof I have herennto set stem between the eollar and a stop or pin at my hand.

the lower end of the stem, and inolines and LAWRENOE M. J UN KIN. notohes upon which the pins of the collar play, Witnesses: substantiaily as and fox` the pnrpose described. T. B. KERR,

2. The combination of the headed barrei JAMES H. POR'DE. ,I 

